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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6963b6aa43e7934cb673e550687fd37ea536a200d7a0f083500ce847764ba60b' 
  AND token = 'FAnqKbF3i0F25eSKlEiAERHRGy/Rkq7E9QeUEPKBu20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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