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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd801e1797b59d8a6d79ecfdd086cf4347e109019dc7add44b239416e9fe27f1d' 
  AND token = '4GVysXbDNTWS1qVBDplmzXSPgkdqZzu1+z550/e3ysA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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