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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a2344c896ea2d4a900d8340cc8928e2bbeff63771a32e577147c2e86baaca984' 
  AND token = 'T2aOcSB0k7FA9galoCF6+mnlFV3P4xVmd+xWBZGmluo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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