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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea428931e50b8cbf91b405ee20f04f50a849cb42d14f73628d78ef7c3c0530e7' 
  AND token = 's0OE1f5pw3ePLluw7+gVTsH5E5p9gNRFOjyI6dFwsWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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