SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '936b332315028a668f0fad8a9ba5e5df0b3402f31d186f1a16fc08b35dce3485' 
  AND token = 'EHPXDPhvthRSCowbvgV4vLQRo1x9YL17BF2RHh6rcQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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