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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9cdf82526dfd79cdfd75f69553a2a1ff6a9ca783b72e09bb54fc5755be10247d' 
  AND token = 'vPuqa5pEx8Hz3FCZqevxxOn7RsMvI0XjC7h81wS8628=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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