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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa3dfc0a3dc2ee97e2e07896f9c026c0fe714918925696ebb917ebe7708a4bf6' 
  AND token = '2od5mVa+lEMsxngg63/JadH0VfLqVJOzdaD6Vyy6l9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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