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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d2afcafca9c85b9d52f28d66e86fe0ea61c2bd0005b7a5c6858fdf7e4b49326' 
  AND token = 'YWfYjK3mobbmhsreHEJueJYa6RtGFZ1GYaJ/LOMm6B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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