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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2844a8af1edc297aed2466273e5c914e96327ae91b9d01f2cf9ffa819477d12e' 
  AND token = 'YI1A+wTuzs0gXh1WB4xVioMNj1wIGgm47LtiqkIH5W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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