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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '347246356d0ca9242f56ab3e061a2a497bdc24b75881057502e23de5e221eee3' 
  AND token = 'HZBdD/Rge+tdq2fW20N0dTuALR1cH2D6lgZ6ZkzPDfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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