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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9205be428892f22680942c2a4da29704ab50cc56186591e72f06c5da77a54ce3' 
  AND token = '14tsy/2XgBMGD4d0bI3hEaR1QqYUZjy3T0FdB0C/r1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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