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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e6805bbb8a583e9dbfcce846c094ac67f83a733ffa32af3d2fef04b373f6f3bd' 
  AND token = 'EDU+C1rdN92e5crv9iPKhEU4epPK4g/77KhOcNTnDRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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