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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fe97ae94a4437db97011519667ea36da3e58264abc9877d890e952a9709bce4' 
  AND token = '4bXwkVAKS9EMlyzw/8IPrkbNK+b5xp/U03hAz0vGX/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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