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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f38e6c794b1d1e336e9c331a54a86d2c8ebceaec49e3ce5571c4e93a6f980ae0' 
  AND token = 'qEkBKBUgtoIWylJB/Kt2JbBpkW71iXk7UGwu9oFQ0+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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