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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93a31574e1800d5b4558e481e9ea0ffc41fd23756def255d9af7947fc12ba614' 
  AND token = '7g/IK4wdgiH5MU4T7bmj36zy1gieqXHOffytdWDk4kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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