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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8622807698534f4dd6a9105249611d76853634cf8bb45e97486243690a7b6d5b' 
  AND token = '6g9cuvNVfBc6zJYQXRH07Ba4M62cwN1cCCL3883Vb5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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