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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '036f96fdff710475a02c7ea5e0b6b3fd4b68c6986d1aeaa13bafe33b146b6db5' 
  AND token = 'FAhcOEGco4dnl1TRqYNyyNerN9E0Wj96q/yFuhORC/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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