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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0b3636ad49b76278cc11409d90356f99432e48b5d9c221dbdc49b947bb1504d5' 
  AND token = 'KI8Xrvh0Q6+FULUzwuK0OZ4rmIqdFiaivXnbyMOpAAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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