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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '46bcea0b3d58c0e3cf10425748fd35b5f829124b217bf325e6ea7aa6eed09973' 
  AND token = 'VK9dV2OpOsjOV5W4TAyB31EFrTCsY0+Aok6Vl5Oy0J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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