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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ea4d6984fd5e2dccde9f7f12aa3aa8b452e3f3cce59315546f59d6eb8b27634' 
  AND token = 'fxwV40y9XL0NWwooVuT5n43mmJOS7G8xB1lLR9CQe9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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