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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e7702518a2f03ba4475863efd4ea74ea4c5d5b12bd1e4340791c9453546e79b' 
  AND token = '70bOdDTtwYy1NhW6Wj4CXWaH8UFEiBmRQ/uyHNuKi50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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