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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '18837f24def6c5f5b94f16109254d7a346c21e29ef75cf6bb3159bd090c7d916' 
  AND token = 'lVHrbfVv2T3lpEU5/b17r3tcq7/YCkcV55HVmBLdHzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}