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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '638ebb96a7253528a371f11c784b5f3e5d495e15e8048bad91103e52634daffb' 
  AND token = 'D+dvMD4NxQLl+UtDswd6twvL3+pmP6BetwbcPJURYLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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