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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd11ae674aac3a2eb427cc507ce5a01fd4b7dc757cd0b488d14e5b4a96f00b656' 
  AND token = 'Af5yb9i3TydqpAKsPPK9YsFaLXFGUnrsHACz9OZC3qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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