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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e0e297735c85c4ea4c3d3b01cc47b9c74623e58d490e6f81c4dbbe6e1171499a' 
  AND token = '3pCoMjNwGKA3BIKfz+RhFCjUCSDBMdShSa5+UiYi4d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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