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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f547668041d32ece3f8fcc858c21384ee389ddeb556da589cb1264dcdb26bcf9' 
  AND token = 'g6J17fK1q9T/r6ztN/stNzpXDXEqYC2ec+cO9qbahhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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