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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '37c59b1bb82407b9fca19c4b690ddd50a895abe525df23925f69ae053e00e69e' 
  AND token = 'h36T0LE9eNdEGFGhIvpaSl0lcKzjMzsPl7PqCBr4y6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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