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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1bc5f937f8d3552b0257e07faf1edd392f88a5fded5e649141dbbe00733172c4' 
  AND token = 'uejYKcWUWfR2FWmafF2CK+LKo1YMInlfEmBK1JILiQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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