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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f4bbbe06aaba26a4030e2883338c161adf7e10c518179cf4370e394685ebd4d4' 
  AND token = 'xng4lt0GkLT76mOfdcvrwONwib0KpG1irVJJMae0nUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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