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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ac55198fdb9bab10ea8be8f78ebb11bbd6291827b5f2b7fa2b9c1a6631fff60a' 
  AND token = '8cubY3BgIszfzUU13YMOREYpoRIGoFligZlsIfKLQ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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