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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9849357c5154f4755a9b773ab77289f0af3f1a89f65e573824e0cfc456c0559b' 
  AND token = 'uFIl593BrmnAKPu/x+s+KMDbiIdPSq9aSbGd0AtobkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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