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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b88771708c34f1f3b2ffc5e55fde2bd9c4ca75a0b43893d405c27c8aab244f8e' 
  AND token = 'tjgYLjNNzUwF1cZMyCp7In42XZgledPNxTbvDeB9E1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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