SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '351b76c65c3c78b2b7029b59ef6a2aad1334f3d962bbdb63c91aed7429475ad8' 
  AND token = 'BPiDLeZVG2O78umC5pfffKSluCwV7zGMGbZGEgAYWYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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