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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c338cd132aeb27238399f6c86a3e0b83c1f1e87f8a6b8e56917c880159a384f9' 
  AND token = 'dlpQ3UTQREWKc/+d4e+l263wut3Z1x8MzGQ/v0yY+uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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