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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '228409fb2354847c56b53496473cc8479b7c228deb9f0d1f4311ec9aca3c6c69' 
  AND token = 'UQcnW+SPZDBVr8+b47DedJL2+tTQVcgQAFSgnsfPgCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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