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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c5028c23999670c0dc73e47b78d7135deab86314742f88f6e683c61594b0450a' 
  AND token = 'e9jH2t7O1xFgRL1Ck+w0kLx65OQoiWuqqhySX6q6H1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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