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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0bf2bf925fe031061b0b1796bc050baf6175e8944d8ff3d34569d4105349f600' 
  AND token = 'Ka/XMW9UQK25FVX5iehLEmJ+Esr/uWcQoYkA2f4t9E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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