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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f77eb73425d44b279af20e733bf4e068826240bc26adab17b5b82b34fe146cfb' 
  AND token = 'vjXLFvAVNl5P2AB75g1RP7qV2qCDR1/cbnB+dLvpnEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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