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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b7fd2ee102792e83e061a36c0a88eca247cc9717aa88ee84378b0b9b9442730' 
  AND token = '1pjlF6bQLY0AcDDCvovIU50VE30i7ibDNmSnkpotQXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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