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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '63c04dd88e29ae8c39835dd182d78fb0b5d255360d329593a4638462d049ede0' 
  AND token = 'Z3zEyIUAaWRTORXbWd/Sb8NAAEkUD/fogsiVd+6X8Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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