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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9323607aeceb48b150232265e8a0c7ecb970bb124986cd002accf23f9b11e7ef' 
  AND token = 'c5X2fnLr7rCKB82/57ZbXph8rps2Nh/Q2g+z85RNoJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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