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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3022ad7d0e20f397ded4ac49ef463beb78d948676a1496bbc9509e5cf52b0c7b' 
  AND token = 'pBk/l3OH3919d/F1uNgRQLNJlEROPRHrwQ/bwyWMFzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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