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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '90917794c2e2a5b402e5d0fd1601498d62b2a6c26330ac73521d6597d6fdb6d5' 
  AND token = 'afm4PfQJ08SaH3y08YRQGfCk4aB0CQbNRHSxMr0lePs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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