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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b5772c0fcb5ae5c9eb3f6ceac31da64b3c55bc1fb7976bf247605511ef07489' 
  AND token = 'tYemMW6LDMy/8MYDozu5JS3D1GprgeD6x0zt46tvMN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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