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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8cf4d4a98ae498efc3d480e3b5737de41cf4551aebfe701c8f6f78c1c6f654a8' 
  AND token = '0p/JH1aL/H8pCwUQSlvPuLc67HuBwFgRXZZgtvqmtdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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