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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c25ea00116e54fc6915088fdb5357004fb29cc05f2e4f46a1f8e1ca280508b6c' 
  AND token = 'Oz4BJyTl6rFM1jBaImjMClUiYgWWDL/5kpEQPsLxI5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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