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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '60007bdd5eff0e8822ce88b64de0d0ed4eb9c233eb86d3a0e85a981cf50afc1f' 
  AND token = 'gbKAMAzqXOvvf4XT7/K+WpuKj87Ma6ESYBSgNslWXVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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