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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0dc0ce622a32028ed9a66a8c25b976d7425331381dd63f82812a75f032429e26' 
  AND token = '9t9WdnEBoYzOTuSFxSj/pUSRT3boPRil6Kh3Cw9ruWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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