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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1f76d8611f5c2d2b34a6064546b7edda03696dc569c2d112ed672d8611af0e46' 
  AND token = '6plnQXoGxVMj9EY/nqn2V66Ap2xAT++4Q3JwUJRX9ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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