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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '112ccfe146b0cc9af78f0d93ef2a4a33476556fc1c4b3d3b2a48f47ba8f21376' 
  AND token = 'So51PQyuMYfVnvnTsOCTjyKeT8e3He0EdD3ZU5SYZyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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