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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'faa9ba394516ea3155ab82b9e59126a08e27c305f27286009e534d3a21d7eeaf' 
  AND token = 'fe7UhDehgr1zAARu0/bhbJoA5K1GT/WwTdPst3FQ2LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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