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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5271df61e598344b325dc80fa46d892c2f9152986fa9d54a4bb82503cfd7f819' 
  AND token = 'MJNoVL1dhq3aO2nRtnH3iD2E6RH8WQtIwB/56MsbcP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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