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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '49bbc042a7191386d99a85673fa1771e85b0799706fb8625aab1d3be252aa083' 
  AND token = 'MOadnkgM5exEJDrYx2zBD+G9Of+GPNZZcFl1dlbfCtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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