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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c8ecab01aaea52a540f2b9cc7cabb4799d0c88296d014bbf009beddd744237f8' 
  AND token = '6ksx7spgjeyDPzYHvxOJR89j/26VbGYhkN0SRfb3e44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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