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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '29b7d7a9b1b16f01d437ab82a547e74a5d2d144ebc1f1aba35c219fe6e74655d' 
  AND token = 'd6ONcj4Y4S7Z6PfdJpZIKKYoG28AQqMnOPqE2G+vpLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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